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** This file is part of the test suite of the Qt Toolkit.
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#include <QtTest/QtTest>

#include <qapplication.h>
#include <private/qguiapplication_p.h>
#include <QtCore/QSet>
#include <QtCore/QFile>
#include <QtCore/QTranslator>
#include <QtCore/QTemporaryDir>
#include <private/qthread_p.h>
#include <QtGui/QPlatformTheme>
#include <QtWidgets/QInputDialog>
#include <QtWidgets/QColorDialog>
#include <QtWidgets/QDialogButtonBox>
#include <QtWidgets/QFileDialog>
#include <QtWidgets/QDesktopWidget>

class tst_languageChange : public QObject
{
    Q_OBJECT
public:
    tst_languageChange();

public slots:
    void initTestCase();
    void cleanupTestCase();
private slots:
    void retranslatability_data();
    void retranslatability();

private:
    QDialogButtonBox::ButtonLayout m_layout;
};


tst_languageChange::tst_languageChange() :
    m_layout(QDialogButtonBox::WinLayout)
{
    if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme())
        m_layout = static_cast<QDialogButtonBox::ButtonLayout>(theme->themeHint(QPlatformTheme::DialogButtonBoxLayout).toInt());
}

void tst_languageChange::initTestCase()
{
}

void tst_languageChange::cleanupTestCase()
{
}
/**
 * Records all calls to translate()
 */
class TransformTranslator : public QTranslator
{
    Q_OBJECT
public:
    TransformTranslator() : QTranslator() {}
    TransformTranslator(QObject *parent) : QTranslator(parent) {}
    QString translate(const char *context, const char *sourceText,
                              const char *disambiguation = 0, int = -1) const
    {
        QByteArray total(context);
        total.append("::");
        total.append(sourceText);
        if (disambiguation) {
            total.append("::");
            total.append(disambiguation);
        }
        m_translations.insert(total);
        QString res;
        for (int i = 0; i < int(qstrlen(sourceText)); ++i) {
            QChar ch = QLatin1Char(sourceText[i]);
            if (ch.isLower()) {
                res.append(ch.toUpper());
            } else if (ch.isUpper()) {
                res.append(ch.toLower());
            } else {
                res.append(ch);
            }
        }
        return res;
    }

    virtual bool isEmpty() const { return false; }

public:
    mutable QSet<QByteArray> m_translations;
};

// Install the translator and close all application windows after a while to
// quit the event loop.
class LanguageTestStateMachine : public QObject
{
    Q_OBJECT
public:
    LanguageTestStateMachine(QTranslator *translator);
    void start() { m_timer.start(); }

private slots:
    void timeout();

private:
    enum State { InstallTranslator, CloseDialog };

    QTimer m_timer;
    QTranslator *m_translator;
    State m_state;
};

LanguageTestStateMachine::LanguageTestStateMachine(QTranslator *translator) :
    m_translator(translator), m_state(InstallTranslator)
{
    m_timer.setInterval(500);
    connect(&m_timer, SIGNAL(timeout()), this, SLOT(timeout()));
}

void LanguageTestStateMachine::timeout()
{
    switch (m_state) {
    case InstallTranslator:
        m_timer.stop();
        QCoreApplication::installTranslator(m_translator);
        m_timer.setInterval(2500);
        m_timer.start();
        m_state = CloseDialog;
        break;
    case CloseDialog: // Close repeatedly in case file dialog is slow.
        QApplication::closeAllWindows();
        break;
    }
}

enum DialogType {
    InputDialog = 1,
    ColorDialog,
    FileDialog
};

typedef QSet<QByteArray> TranslationSet;
Q_DECLARE_METATYPE(TranslationSet)

void tst_languageChange::retranslatability_data()
{
    QTest::addColumn<int>("dialogType");
    QTest::addColumn<TranslationSet >("expected");

    //next we fill it with data
    QTest::newRow( "QInputDialog" )
        << int(InputDialog) << (QSet<QByteArray>()
                    << "QDialogButtonBox::Cancel");

    QTest::newRow( "QColorDialog" )
        << int(ColorDialog) << (QSet<QByteArray>()
                    << "QDialogButtonBox::Cancel"
                    << "QColorDialog::&Sat:"
                    << "QColorDialog::&Add to Custom Colors"
                    << "QColorDialog::&Green:"
                    << "QColorDialog::&Red:"
                    << "QColorDialog::Bl&ue:"
                    << "QColorDialog::A&lpha channel:"
                    << "QColorDialog::&Basic colors"
                    << "QColorDialog::&Custom colors"
                    << "QColorDialog::&Val:"
                    << "QColorDialog::Hu&e:");

    QTest::newRow( "QFileDialog" )
        << int(FileDialog) << (QSet<QByteArray>()
                    << "QFileDialog::All Files (*)"
                    << "QFileDialog::Back"
                    << "QFileDialog::Create New Folder"
                    << "QFileDialog::Detail View"
#ifndef Q_OS_MAC
                    << "QFileDialog::File"
#endif
                    << "QFileDialog::Files of type:"
                    << "QFileDialog::Forward"
                    << "QFileDialog::List View"
                    << "QFileDialog::Look in:"
                    << "QFileDialog::Open"
                    << "QFileDialog::Parent Directory"
                    << "QFileDialog::Show "
                    << "QFileDialog::Show &hidden files"
                    << "QFileDialog::&Delete"
                    << "QFileDialog::&New Folder"
                    << "QFileDialog::&Rename"
                    << "QFileSystemModel::Date Modified"
#ifdef Q_OS_WIN
                    << "QFileSystemModel::My Computer"
#else
                    << "QFileSystemModel::Computer"
#endif
                    << "QFileSystemModel::Size"
#ifdef Q_OS_MAC
                    << "QFileSystemModel::Kind::Match OS X Finder"
#else
                    << "QFileSystemModel::Type::All other platforms"
#endif
//                    << "QFileSystemModel::%1 KB"
                    << "QDialogButtonBox::Cancel"
                    << "QDialogButtonBox::Open"
                    << "QFileDialog::File &name:");
}

void tst_languageChange::retranslatability()
{
    QFETCH( int, dialogType);
    QFETCH( TranslationSet, expected);

    if (m_layout == QDialogButtonBox::GnomeLayout)
        QSKIP("The input data are not suitable for this layout (QDialogButtonBox::GnomeLayout)");

    // This will always be queried for when a language changes
    expected.insert("QCoreApplication::QT_LAYOUT_DIRECTION::Translate this string to the string 'LTR' in left-to-right "
                    "languages or to 'RTL' in right-to-left languages (such as Hebrew and Arabic) to "
                    "get proper widget layout.");

    TransformTranslator translator;
    LanguageTestStateMachine stateMachine(&translator);

    switch (dialogType) {
    case InputDialog:
        stateMachine.start();
        QInputDialog::getInteger(0, QLatin1String("title"), QLatin1String("label"));
        break;

    case ColorDialog:
#ifdef Q_OS_MAC
        QSKIP("The native color dialog is used on Mac OS");
#else
        stateMachine.start();
        QColorDialog::getColor();
#endif
        break;
    case FileDialog: {
#ifdef Q_OS_MAC
        QSKIP("The native file dialog is used on Mac OS");
#endif
        QFileDialog dlg;
        dlg.setOption(QFileDialog::DontUseNativeDialog);
        QString tempDirPattern = QDir::tempPath();
        if (!tempDirPattern.endsWith(QLatin1Char('/')))
            tempDirPattern += QLatin1Char('/');
        tempDirPattern += QStringLiteral("languagechangetestdirXXXXXX");
        QTemporaryDir temporaryDir(tempDirPattern);
        temporaryDir.setAutoRemove(true);
        QVERIFY(temporaryDir.isValid());
        const QString finalDir = temporaryDir.path() + QStringLiteral("/finaldir");
        const QString fooName = temporaryDir.path() + QStringLiteral("/foo");
        QDir dir;
        QVERIFY(dir.mkpath(finalDir));
        QFile fooFile(fooName);
        QVERIFY(fooFile.open(QIODevice::WriteOnly|QIODevice::Text));
        fooFile.write("test");
        fooFile.close();
        dlg.setDirectory(temporaryDir.path());
#ifdef Q_OS_WINCE
        dlg.setDirectory("\\Windows");
#endif
        dlg.setFileMode(QFileDialog::ExistingFiles);
        dlg.setViewMode(QFileDialog::Detail);
        stateMachine.start();
        dlg.exec();
        QTest::qWait(3000);
        break; }
    }

    // In case we use a Color dialog, we do not want to test for
    // strings non existing in the dialog and which do not get
    // translated.
    if ((dialogType == ColorDialog) &&
#ifndef Q_OS_WINCE
        (qApp->desktop()->width() < 480 || qApp->desktop()->height() < 350)
#else
        true // On Qt/WinCE we always use compact mode
#endif
        ) {
        expected.remove("QColorDialog::&Basic colors");
        expected.remove("QColorDialog::&Custom colors");
        expected.remove("QColorDialog::&Define Custom Colors >>");
        expected.remove("QColorDialog::&Add to Custom Colors");
    }

    // see if all of our *expected* translations was translated.
    // (There might be more, but thats not that bad)
    QSet<QByteArray> commonTranslations = expected;
    commonTranslations.intersect(translator.m_translations);
    if (!expected.subtract(commonTranslations).isEmpty()) {
        qDebug() << "Missing:" << expected;
        if (!translator.m_translations.subtract(commonTranslations).isEmpty())
            qDebug() << "Unexpected:" << translator.m_translations;
    }

    QVERIFY(expected.isEmpty());
}

QTEST_MAIN(tst_languageChange)
#include "tst_languagechange.moc"